I thought I would cross-post about it here, because I have given special attention to including all the "advanced biquad" transfer function coefficients that are needed to implement the crossover filters in the MiniDSP (with one of the advanced plug-ins). Because of this, you can establish a very accurate model of the loudspeaker and the crossover filters in the ACD tools, such that when you measure the frequency response of the loudspeaker with the crossover implemented via the MiniDSP, you can essentially exactly reproduce what is predicted by the ACD tools.

This is a great step forward in crossover design, available for free (for non-commercial use). You can create a crossover, push the updates to the MiniDSP, give it a listen, and go back to tweak levels and parameters in only a few minutes time! The ACD tools permit you to implement a wide array of filter types, not just a few standard crossovers. Please download and read the technical manual for full details on the capabilities of the ACD tools. The link is found in the main thread (see link above).

If you can make accurate frequency response measurements of your drivers (in box) you can use the ACD tools. With the advent of inexpensive (or free) measurement software and microphones, this capability is well within reach of DIY speaker enthusiasts.

Happy DIY-ing!

-Charlie

knuisje

8th May 2012 08:28 AM

Wow unbelievable, it must have been a very lot of work to make this. :eek:
Though not easy working with 3 spreadsheets, it works very well using the excellent tutorial.

minidsp

8th May 2012 08:40 AM

Wow.. That's indeed an amazing piece of work Charlie!!

Thanks for sharing that to the community! Let me put that on the miniDSP Forum as well with a sticky! A very good work that it well worth getting more attention and practice by our community members..

Thanks again for sharing Charlie

DevTeam

CharlieLaub

8th May 2012 08:06 PM

Quote:

Originally Posted by knuisje
(http://www.diyaudio.com/forums/showthread.php?p=3015994#post3015994)

Wow unbelievable, it must have been a very lot of work to make this. :eek:
Though not easy working with 3 spreadsheets, it works very well using the excellent tutorial.

Hi Knusjie,

Glad you like it! I want to say that a spreadsheet I found for calculating the biquad coefficients MiniDSP forum, that you created, got me thinking about developing all of this back in October of last year. The ACD tools blossomed into what you see today out of that initial effort. I have redone all the biquad calcs myself using a different calculation method, but your effort got the idea going in my head. Thanks!

-Charlie

CharlieLaub

22nd May 2012 05:25 AM

I've posted a new release of the ACD tools for loudspeaker crossover design!

One important improvements was to document how to change the sampling rate to suit the MiniDSP product that you might be using.